The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 1996
Filed:
Feb. 22, 1995
Keiji Moriyama, Kanagawa-ken, JP;
Nikon Corporation, Tokyo, JP;
Abstract
With a focus detection device equipped with focus detecting optical systems with focus detection areas both on and outside the optical axis of the photographic surface, a focus detection device suppresses vignetting of the focus detection light fluxes through incompatibilities with the exit pupil of the installed objective lens and has stable focus detection accuracy. With a focus detection device equipped with at least two focus detecting optical systems and on each focus detecting optical system, which forms the image that comes through the objective lens for each focus detecting optical system as a second image on a set of photoelectric transforming element arrays, and which carries out focus detection of the objective lens through relative position of the second image, reverse projections through the condenser lens of the diaphragm openings opposite the focus detecting optical systems with focus detection areas outside the optical axis of the photographic surface face toward the optical axis of the objective lens and cross the optical axis.